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Dyno Results 540 CID Indy 345 CNC
#3198549
12/19/23 10:56 AM
12/19/23 10:56 AM
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Joined: Jan 2003
Posts: 16,925
NC
440Jim
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This is the results of a friend's new big block Mopar engine.
New BMP aluminum block, new Indy heads 2023
540 CID, 4.500” x 4.250”
Aluminum rods
Indy 440-1 CNC 345 heads (Some work done after receiving from Indy, i.e. not Out-Of-The-Box)
Indy 4500 intake
1050 Dominator Carb
285/292 at 0.050", 108 LSA Comp roller cam (318/330 at 0.020")
Lift 0.753”/0.753” at 1.6, cam card 0.706”/0.706” at 1.5 rocker ratio
745 ft-lb at 5600 rpm
919 hp at 6900 rpm
Last edited by 440Jim; 12/19/23 07:39 PM. Reason: added head work
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Re: Dyno Results 540 CID Indy 345 CNC
[Re: 440Jim]
#3198558
12/19/23 11:34 AM
12/19/23 11:34 AM
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Joined: Jan 2003
Posts: 10,022
MN
JERICOGTX
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Nice numbers. Compression ratio? Alchohol?
69 GTX
68 Road Runner
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Re: Dyno Results 540 CID Indy 345 CNC
[Re: JERICOGTX]
#3198562
12/19/23 11:50 AM
12/19/23 11:50 AM
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Joined: Jan 2003
Posts: 16,925
NC
440Jim
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~13 CR 12.7 CR
Racing gas
vacuum pump
Last edited by 440Jim; 12/19/23 02:22 PM. Reason: Corrected CR with new info
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Re: Dyno Results 540 CID Indy 345 CNC
[Re: 440Jim]
#3198564
12/19/23 11:56 AM
12/19/23 11:56 AM
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Joined: Jan 2003
Posts: 10,022
MN
JERICOGTX
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I Live Here
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12.7 CR
Racing gas
vacuum pump Interesting. Makes more Trq, and HP than my 563 with 345CNC heads, with less compression, cam, cubes, and carb. I must have done something wrong.
69 GTX
68 Road Runner
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Re: Dyno Results 540 CID Indy 345 CNC
[Re: JERICOGTX]
#3198566
12/19/23 12:03 PM
12/19/23 12:03 PM
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Joined: Jan 2003
Posts: 13,360
Marion, South Carolina [><]
an8sec70cuda
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Posts: 13,360
Marion, South Carolina [><]
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12.7 CR
Racing gas
vacuum pump Interesting. Makes more Trq, and HP than my 563 with 345CNC heads, with less compression, cam, cubes, and carb. I must have done something wrong. Precisely why there isn't a dyno racing class.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: Dyno Results 540 CID Indy 345 CNC
[Re: 440Jim]
#3198606
12/19/23 01:14 PM
12/19/23 01:14 PM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
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What does that -8 +26 HP sequence indicate at 6700?
Would a carb spacer help smooth that out?
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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Re: Dyno Results 540 CID Indy 345 CNC
[Re: jcc]
#3198614
12/19/23 01:29 PM
12/19/23 01:29 PM
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Joined: Jan 2003
Posts: 19,363
Las Vegas
Al_Alguire
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As we all know what it runs in the car is the ultimate gauge. Dynos are dynos as they say. Dont get to caught up in those numbers especially when you dont have things like BSFC and correction to look at
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Dyno Results 540 CID Indy 345 CNC
[Re: jcc]
#3198616
12/19/23 01:30 PM
12/19/23 01:30 PM
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Joined: Jan 2003
Posts: 19,363
Las Vegas
Al_Alguire
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I Live Here
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Las Vegas
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What does that -8 +26 HP sequence indicate at 6700?
Would a carb spacer help smooth that out? Could easily just be an issue with the dyno.....
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: Dyno Results 540 CID Indy 345 CNC
[Re: jcc]
#3198656
12/19/23 03:27 PM
12/19/23 03:27 PM
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Joined: Jan 2003
Posts: 14,496
So. Burlington, Vt.
fast68plymouth
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So. Burlington, Vt.
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What does that -8 +26 HP sequence indicate at 6700?
Would a carb spacer help smooth that out? The dyno measures tq, and calculates the hp. Since all the results are above 5252rpm, the differences from the tq curve will be exaggerated in the HP curve. My guess is, looking at the jog in the tq curve, it was some sort of brief misfire(drop in tq), then the load cell gets a little tug when the misfire recovers(spike in tq). If you applied some “smoothing” to the curve, in that area of the curve, the numbers should be more representative of reality. Unless of course you see the same jog in the data on every run, in the same place…….. which still wouldn’t rule out a misfire, but would indicate something is creating the misfire(if that’s in fact the problem), and that it’s not completely random.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Dyno Results 540 CID Indy 345 CNC
[Re: AndyF]
#3198676
12/19/23 04:41 PM
12/19/23 04:41 PM
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Joined: Jan 2003
Posts: 10,022
MN
JERICOGTX
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I Live Here
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What is it going into Jim?
69 GTX
68 Road Runner
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Re: Dyno Results 540 CID Indy 345 CNC
[Re: fast68plymouth]
#3198685
12/19/23 05:25 PM
12/19/23 05:25 PM
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Joined: Jan 2003
Posts: 16,925
NC
440Jim
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If you applied some “smoothing” to the curve, in that area of the curve, the numbers should be more representative of reality. Me being a numbers guy... I did a curve fit of the dyno torque, and then calculated the HP at each point from the "smoothed" torque equation. Here it is:
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Re: Dyno Results 540 CID Indy 345 CNC
[Re: fast68plymouth]
#3198701
12/19/23 06:59 PM
12/19/23 06:59 PM
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Joined: Dec 2003
Posts: 22,696
Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,696
Bitopia
|
What does that -8 +26 HP sequence indicate at 6700?
Would a carb spacer help smooth that out? The dyno measures tq, and calculates the hp. Since all the results are above 5252rpm, the differences from the tq curve will be exaggerated in the HP curve. My guess is, looking at the jog in the tq curve, it was some sort of brief misfire(drop in tq), then the load cell gets a little tug when the misfire recovers(spike in tq). If you applied some “smoothing” to the curve, in that area of the curve, the numbers should be more representative of reality. Unless of course you see the same jog in the data on every run, in the same place…….. which still wouldn’t rule out a misfire, but would indicate something is creating the misfire(if that’s in fact the problem), and that it’s not completely random. Thank you
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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